From df7a819fd9b147248d814bc69b883f49446feae9 Mon Sep 17 00:00:00 2001
From: David Schweikert <david@schweikert.ch>
Date: Sun, 29 Jul 2018 08:27:04 +0200
Subject: [PATCH] Allow running fping --help even when raw socket can't be
 opened, fixes #131

---
 CHANGELOG.md | 1 +
 src/fping.c  | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e164a0e..7641dac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ fping 4.1 (UNRELEASED)
 
 - Fix problem when socket fd is 0 (#125, thanks Ramón Novoa!)
 - Fix running on servers with disabled IPv6 (#118, thanks Simon Matter)
+- Allow running "fping -h" or "--help" even when raw socket can't be opened (#131, thanks @teto)
 
 fping 4.0 (2017-04-23)
 ======================
diff --git a/src/fping.c b/src/fping.c
index 401cbda..8b9ce25 100644
--- a/src/fping.c
+++ b/src/fping.c
@@ -352,6 +352,12 @@ int main(int argc, char** argv)
     HOST_ENTRY* cursor;
     struct optparse optparse_state;
 
+    /* pre-parse -h/--help, so that we also can output help information
+     * without trying to open the socket, which might fail */
+    if(argc == 2 && ( strcmp(argv[1],"-h")==0 || strcmp(argv[1],"--help")==0 )) {
+        usage(0);
+    }
+
     socket4 = open_ping_socket_ipv4(ping_data_size);
 #ifdef IPV6
     socket6 = open_ping_socket_ipv6(ping_data_size);